Effectively her benefactor and first actual friend whom she had saved. Subaru is also the first non-elf that did not begrudge her due to her heritage. Because of this, Emilia felt relieved that someone acknowledged her existence and didn't disgrace her bloodline. After many trails and tribulations together she begins to develop feelings for Subaru subconsciously in the mid to near end of Arc 4 and after their relationship strengthen and he is made her knight. Emilia becomes more aware of her innermost feelings towards him in the successive arcs, however she is held back by grappling with what it means love someone unplatonically herself and wants to understand those feelings.
Emilia's loyal partner. According to their contract, even if Pack's mana is too low he will do his job in order to protect her until his death.
Certain people, such as Echidna and Pandora, have referred to Emilia as "the witch's daughter", with Pandora also mentioning that she was of the witch's bloodline after seeing her power, hinting at some sort of connection between Emilia and Satella, though nothing has been explained.
One of Roswaal's servants and in turn her servant. Usually spends more time with her than Rem. After the harrowing events of Arc 4 they become much closer and friends in the truest sense.
Emilia's benefactor and backer for her bid to acquire the throne. He's considered odd lord especially his fondness for demi-humans like her to the point where he would hire them. In truth he was only actually using her to control Subaru and coercion him into using Return By Death to forfill his ambition of reviving his late master through the wit of his Gospel. To do he needed a guaranteed way to put Emilia on the throne because he had no faith in Emilia's resolve to overcome her past and deeply-rooted hatred of the Witch of Envy. However with the encouragement and support of Subaru and several others Emilia shatters his expectations by passing all 3 of Echidna's trials. He is then forced into backing her earnestly.
Post events of Arc 4, she and Emilia have become good friends after Beatrice became more sociable.
After throwing his lot with her after the events of Arc 4, he's become a personal adviser to Emilia. Otto also sympathies with her circumstances as he too had suffered under discrimination in his childhood and views her as strong person to bare all that.
After the harrowing events of Arc 1 where she helped saved her life, Felt has come to respect Emilia and regard as big sister.
Though she has only spoken to her after Crusch's memory loss the highborn lady did not think any less of her becasue of true nature and treated Emilia with the utmost respect as both a worthy rival and potential friend. Due to this Emilia regards her as an explanatory and warm-hearted person.
Pandora seems to be acquainted with Emilia's family. and implied to have been involved with happened with her parents. Pandora has refered to Emilia as "the witch's daughter".
Her parental aunt and only known living blood-relative. She raise her in place of her parents from most of her life. Emilia considers her real mother because of it.
Petelgeuse knew Emilia when she was a child, often visiting her and her aunt Fortuna, enough to be described as being like a family. He cared about her deeply as he tried protected her with his life when Regulus and Pandora attacked her forest. However, after he went mad, he no longer recognizes her.
Echidna claims to have hated Emilia from the moment she first saw her. During her trial where Emilia was forced to face her past, Echidna made several derogatory remarks at the half-elf, mocking her for her dependence on Subaru. Echidna also seems to have some knowledge about Emilia's parents, claiming that she is as just as stubborn as her mother. Echidna adds she personally knows her real mother and it is one of the reasons for her hatred. Despite all this, Emilia mentioned that she doesn't hate Echidna at all.